Filter for metallurgical and other purposes.



G. G. PATTERSON.

FILTER FOR METALLURGICAL AND OTHER PURPOSES.

APPLICATION FILED SEPT. 22, 190B.

Patented Jan. 18,1910.

2 SHEETS-SHEET 1.

G. G. PATTERSON.

FILTER FOR METALLURGICAL AND OTHER PURPOSES.

APPLICATION FILED SEPT. 22,1908.

Patented Jan. 18, 1910 2 SHEETS-SHEET 2.

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UNITED STATES PATENT onnion.

CLARENCE G. PATTERSON. 0F BERKELEY, CALIFORNIA. ASSIGNOR IO THE BUTTERS ?ATENT VACUUM FILTER COMPANY, INCORPORATED, A CORPORATION OF NEVADA.

FILTER FOR METALLURGICAL AND OTHER PURPOSES.

Specification of Letters Patent.

Application filed September 22, 1908.

Patented Jan. 1 8, 1910. Serial No. 454,230.

To all whom it may concern:

Be it known that l, CLARENCE G. Pa'r'rnnson, a citizen of the United States, and a resident of Berkeley, California, have invented certain new and useful Improvements in Filters for Metallurgical and other Uses, of which the following is a specification.

The improved filter was primarily designed for use in the cyanid process for treating ores and is particularly desirable for filtering slimy ores or slime of a nature that tends to clog the filter after a layer of considerable thickness has been formed upon thefiltering surface. It has long been the practice toseparate the Willie-bearing sointion from the pulp by means of filters and after impoverishing the precipitate by washing it with weaker solution or clear water to remove and discard the filtrate on the dump heap and to treat the value-bearing solution for the recovery of the values contained in them.

The present improvement. is particularly adapted for such practice and provides quick and ready access for the purpose of cleaning both sides of the filtering cloth or medium,, or for repairs. It also provides for the'ready discharge of the layer of pre cipitate. when the same has accumulated to such a' thicknss as to make further filtration l undesirable before the filter is freed from it. It allows the layer of precipitate to be (lischarged by a reverse current of air, if dc sired, instead of water. through the filtering medium. and it provides for the interchange, repair, or renewal of relatively small por tions of a filter leaf without disturbing the other portions. ()thcr valuable features of the invention will be readily appreciated from the following description.

In the drawings I have illustrated the improved filter in the best form at present known to me, but T of course wish to be protected in the various features of the improvement. It will be understood that many features can be. used separately or in combination with others and can be present in widely differing forms from those which I illustrate.

Figure l is a face view of a filter leaf broken off at one end. as its length is immaterial. Fig. 9 is an end view of three such filter leaves placed together in proper working relation. Fig. 3 is a cross-section of Fig. l on the section plane 3-3. Fig. 4 is a detail view in section through the filter bag to show the details of construction of one of the units or members of the composite filter leaf of Fig. 1. Fig. 5 is a central longitudinal section of the same. Fig. 6 is a detail cross-section of the upper member of a modification of the filter leaf frame. Fig. 7 is a reduced size illustration of a modification of the educting connections of the filter members or units. Fig. 8 is a view of a modification of the coupling connections of the filter units or members.

Under my preferred construction a large number of filterlcavcs such as are illustrated in Fig. 1 may be placed side by side close together. as in Fig. .2, and suspended in a suitable filter tank by the projecting ends of the horiztmtal top member of each. Each full size working leaf or frame may contain twenty separate filter bags or filter units, all of which can be separately and quickly detached from the frame and from each other for repairs or very thorough cleaning when desired. The frame illustrated in Figs. 1, 2, and 3 comprises two panels formed by three vertical uprights or members 10. five inches wide by one inch thick, :1 horizontal bottom member 11 preferably about an inch and a half thick and set on edge. as illustrated, and provided with strips of non-corrosive metal secured on either side as at 12 to form a groove for receiving and alining the lower ends of the filter bags or units: a stout horizontal header 13 secured to the upper ends of the uprights 10. as shown. and projecting at each end as at H in order that the filter frame may be hung thereby upon the side walls of the tank.

of appropriate size; a horizontal header pipe 15 extending lengthwise beneath the wooden header member 13 and provided with. one or more outlets or main connections 16 for connection preferably with a partial vacuum so as to apply suction to the interior-of the filtcr members and with as many depending suction tubes 17 as there are separate filter bags or units; and guide bars 18, 19, of suitable non-corrosive metal secured in position to hold the filter bags or units in alinement in the frame at their upper ends. The buide bars 18 on one side of the frames are hinged as at 20 to swing outwag-d andupward clear of the bags, so the bagsma-ybe conveniently taken out, and clamping hooks 21 preferably pivoted to the fixed guide bars 19 provided at suitable intervalsto hold the guide bars 18 in their g clear the pipe 17 and the bar 18, after which closed position, or to release them at will.

Theiilter leaf may be divided into several panels by intermediate uprights 10. When several of the filter frames have been hung in the tank the edges of the uprights 10 come together, as shown in Fig. 2, and hold the opposed filtering surfaces separatedby an interval of a few inches, sufiicient to allow the filter cakes of precipitate to be formed on the respective faces of each frame or leaf without interference from the adjacent leaf. 1 s

The individual filter units 30, ten of which constitute a single panel of the leaf shown in Fig. l, consist primarily of a bag of canvas or other suitable filtering material tightly stretched upon an inner form of wood having preferably the following construction. The Width of each center is sufiicient, allowing for the thickness of the canvas, to make one-tenth of the panel of the filter leaf. At its lower end'it is rabbeted to'form a tongue 32 which, with the" canvas bag, is received in and registers with the groove formed between the metal strips 12 of the filter frame. The front and rear. faces of the form or center are grooved vertically to form vertical channels, asat'33, for the filtrate, and are provided with horizontal cross-channels 3 1 which lie partly below the level of the guide bars 18 ,19and partly underlie those uidebars. ii)epend-. ing pipe connections I extend down somewhat lower than the top of these forms or centers loosely fitting a recess at the to of the same, as seen in Figs. '4 and 5. Each of the Wooden forms is divided by slightly 0blique longitudinal cuts 35 into a central wedge-shaped member 36' and twolateral membrrs which fit such wedge. The wedge member is preferably provided with a bolt 37 secured by a nut'38 and the head of which, 39, projects slightly into the recess at the upper end of the form so that it can be made use of for taking hold of the wedge piece by a suitable means and drawing it out forcibly from between the two side pieces of the form when it' is desired to remove the form from the interior of the bags, the fflbllC'Of which 1s shown at 31 in cross section in Figs. 4 and 5. The bags tightly fit the'forms and at their upper end when in place in-a filter frame they are drawn tightlyaround the respective pipes 17 and wrapped lightly thereto by means of strong cords 40 which are then tied.

It will be understood that. the filter bags and their contained wooden forms are sepa rately and severally removable from the filter leaf. This is done by unwrapping the cord "17 then swinging the bar ,1 l1

'thelowerend of the form 40, opening the mouth of the ba so as. to enable it to clear the'lower end 0 the ipe onto the wa y and bringing the upper on of the filter bag and its wooden form forward so as to the filter bag maybe raised, drawing the tongue 32 clear of the lower member of the filter frame. The wedge 36 may be then drawn out of the bag, applying forceby means of the head 39 if necessary, and then the side members ofthe form may be drawn out and the bag thoroughly cleaned or re paired or a new bag substituted. In assembling, the side members of the form are first put in the bag and then'the middle or wedge piece 36 is thrust into place, expanding the. side pieces and the bag and making prefer ably a very tight fit of thebag upon the inclosed form. Preferably the cord is run through a hem at the upper end of the bag. as a drawin string. hen, therefore, has'been putin place between the strips 12 and the upper end brought into alinement with the pipe 17, the string +10 is drawn tight and wrapped around the neck of the bag so as to close the bag around the pipe 17, as shown in Figs. =l,and 5. lYhen all the members of the panel are in place, the bar-18 is returned to its normal position and clamped by the clamp. hooks 21, as seen in Fig. 5. \Vhen such a filter leaf is put in the tank, the bath should preferably rise to a point slightly above the wrapping 40. In the first use of the bag after it has been first put in place or has been thoroughly cleaned inside and out, the slimes depositin on its exterior when the suction is applie to its interior through the pipe 17, substantially and eventually completely incases and seals the portions of the bag above the bars 18 and 19 because this portion of the slimes upon the bag may remain intact-and undisturbed while the filter is used very many times, being cleansed by merely discharging the deposit from the lower portions of the filter with the aid of a reverse current of air or water preferably introduced under pressure inside of the bag. During suction and while the filter is' immersed in the bath the filtratepassing through the canvas and along the grooves 3 through the cross-grooves 34 finds its way to the. educting pipe 17 and the suction is -onnnunicatcd with substantial uniformity to the whole active surface of the filter. lVlu-u a deposit of the maximum permissible or desired thickness has been formed on the two faces of the filter leaf and pref.- erably impoverished and washed, the entire deposit or cake covering the face of the panel, one on each side below the bars '18 and 19. may be loosened and dropped off in itsentirety by introducting pressure into the interior of the filter. A cross-groove 3i ly- Illb 'cake in its entirety.

irectly under the comparatively sharp l ing it with P out the longitudinal grooves 35) loosens the i Preferablv the rabheting which forms the tongue at tl'lis car ried somewhat higher than the upper edge of the bars 12 so as to form a cross-groove which will act snn larly to the grcmve ll.

or assembling the filter gether with the frames of the filter, may be & B paint or other impervious paint. along the line of the upper edge of the groove 34 as at 175. I

It will be seen that the construction described provides for the carrying and correct alining of the filter members in the filter frame, the proper alining and spacing of the filter frames or leaves in respect. to each other, and ready means for taking to pieces leaves which. to-

I readily taken to pieces and packed on muleand facilitate the clean release of the lower edge of the cake at the bars or strips 12.

After the discharge of the cake the filter 5 may be used again any number of time without disturbing the deposit which lS formed upon and virtually seals the upper portion of the bag over the bars 18 add 19, thus obviating the need of rendering these portions of the filter impervious.

f other of the The ten filter bags or filter units that. form 1 a single panel he closely together. as seen in Fig. It and their faces lying all in the same plane constitute in effect a single strong and throughout which the very evenly applied.

In the modification shown in Fig. (3 a rcc filtering suction is very even filtering surface tangnlar tubular metallic header men'iher 131 is shown which may be substituted for the combined wooden header 13 and suc tion tube with the respective filter bags may be di The tubes 17 for connecting rectly tapped into the bottom of this and i the ma1n suction connection 16 tapped into 1t atthe top.

may

be The ends of course will be closed, as must of course also be the ends of the header pipe 1.").

For use where for any prefer to have the filtrate bottom of the filter instead of the educting tube is extended all the way down through the middle or wedge member so to form, as seen at 171 (Fig. 7.) an openinginto the rabbeted portion at, the bottom of the form. In this case it is necessary to have a drawn from the top. the 1 union connection 172 between the pipe 17L and the pipe 17, or some connection. so as to allow the removal of the filter unit and so also as to insure the suct ion being applied first at the and not at the top.

in Fig. 8 a further mtalification is shown in which a sho'rt pipe. connection 17% proscrewed to the top of the wooden form is employed and the HIIIOII connection 172 used both to make fimdconnection with the pipe such conditions and also when tlexible and tight bottom of the form is secured or;

f l i l back or in any other conveniently small and light packages for transportation when desirable. To facilitate this the joints between the uprights 1t) and the horizontals l1 and 13 are preferably secured by non corrosive screws or in other convenient detachable manner.

lVithout atten'ipting to enumerate any invention is susceptible, I claim the followmg:

l, A filter having a filter frame comprising uprightsupports and lower and upper transverse supports, a plurality of separable and f detachable forms mounted on the supports,

and filtering septa upon said forms.

2. A filter havlng a filter frame comprising upright supports and lower and upcr trans- 5 verse supports, a plurality of separable and detachable forms mounted on the supports. and filtering septa upon said forms. said supports having cduction passageways communicating with said forms and septa.

A filter having afiltcr frame comprising upright supports and lower and upper transverse supports. a plurality of separable and detachable forms mounted on the supports. and filtering: septa upon said forms, said supports having eduction passageways for the tilt rate.

4. A liltcr having a filter frame comprising upright supports and lower and upper trans verse supports. a plurality of separable and dctachablc forms mounted on the supports. and filtering septa upon said forms. said supports and said forms both having connmmirating passageways for lluid.

5. A filter having a filter frame comprising upright suports and lower and upper trans verse supports. 'a plurality of separable and detachable forms mounted on the supports. and filtering septa upon said forms substantially inclosing the forms severally, and ducts in ctnnmunication with the interiors of said septa.

6. A. filter leaf comprising a frame and a plurality of filtering units composing a substantially uninterrupted panel and severally and detachably secured to the frame.

7. A filter leaf comprising a frame and a plurality of filtering units composing a panel and means for securing the units in the panels comprising at least one grooved many modificatitms of which the member for receiving and holding one portion of each unit and at least one movable guide bar.

8. A filter leaf comprising a frame and a plurality of filtering units composing a panel and means for securing the units in E the panels comprising at least one grooved a member for receiving and holding one por- 1 tion of each unit and at least one movable I I nels in communication with said conducting guide bar, said frame having spacing members for spacing it in respect to similar frames, and projecting-means for supporting the frame in a tank.

9. A filter leaf comprising a frame and a plurality of filtering units having separate septa compo ing a panel and carried by the 3 frame, said frame having means for loosely f filtering septa constituting a Joint septum spacing it in respect to similar frames.

lOrA filter leaf comprising a frame and a plurality of filtering units composing a substantially uninterrupted panel, said units consisting of a plurality of detachable parts j and said units being separably secured to g the frame.

1 l 11. A filter leaf comprising a frame and a i plurality of filtering units composing a sub-.

stantially" uninterrupted panel, and conduct ingconnections severally and separably connected with the respective filtering units.

12. A movable filter leaf comprising one or more panels each comprising a plurality E of filtering units detachably held together.

13. A-movable filter leaf comprising one or more panels, each comprising a plurality of filtering units provided with separate conducting connections, and a common pipe or duct for the said connections, forming a part. of the said filter leaf.

1 1. A filter having a frame comprising upright and horizontal members, one of the horizontal members having a channel or groove for receiving one or more filter units, two guide bars for holding one or more filter units between them, and fluid-conducting connections, in combination with the one or more filter units.

15. A filter having aframe comprising upright and horizontal members, one of the horizontal members having a channel or groove for receiving one or more filter units, two guide bars for holding one or more filter units between them, and fluid-conducting connections, in combination with the one or more filter units, each comprising an interior 1 form and a filtering septum.

16. A filter having a, frame comprising upright and horizontal members, one of the horizontal members having a channel or groove for receiving one or more filter units. 1

two guide bars for holding one or more filter or groove, and a filtering septum.

17. A filter having a frame comprising upright and horizontal members, one of the horizontal members having a channel or groove for receiving one or more filter units, 1 two guide bars for holding one or more filter units between them, and fluid-conducting connections, in combination with the one or more filter units, each comprising a form carrying a filtering septum and having chanconncctions.

18. A filter having a composite panel combining a plurality of units having a plurality of filtering septa for receiving a united layer of precipitate.

19. A filter having a composite filtering panel comprising a plurality of separable for holding a layer or cake of precipitate.

'20. A filter having a composite filtering panel com n-isiug a plurality of separable filtering septa constituting a joint septum for holding a layer or cake of precipitate, and means for communicating suction or pressure simultaneously to the sepa ate septa.

21. A filter having a composite filtering panel comprising a plurality of separable filtering septa constituting a joint septum for holding a layer or cake of precipitate and supported from its filtrate side against collapse and also against substantial infiation by reversed pressures.

22. In a filter, a plurality of separate expansible forms incloscd in filtering septa, means for carrying and holding the same side by side, and a common fluid connection in communication with the separate forms and septa.

23. In a filter, a plurality of separate expansible forms inclosed in filtering septa, and means for carrying and holding the same side by side, comprising detachable means for releasing them.

24. In a filter, a tubular septum, having an interior expansible and collapsible form.

25. In a filter, a tubular septum having an interior expansible and collapsible form with channels lengthwise of the tube and a cross channel and an educt ng connection in communication with the said cross channel.

26. In a filter, a tubular septum, having an interiorv form comprising means for stretching the septum.

27. In a filter, a tubular septum, having an interior form, an eduction pipe extending into the interior of the septum but loose from the form, and means for confining the septum about the said pipe.

28. In a. filter. a tubular septum having an interior form comprising wedging means for facilitating a tight fit between septum and form.

29. In a filter, a tubular septum having an interior form comprising a plurality of llO relatively movable pieces titted together along lines oblique to the edges of the form.

30. A filter or filter unit, -hav ng a filter bag. an interior support therefor, supports external to the bag for both holding the interior suport 111 place and definitely lllllr iting connections for the interior of the bag.

31. A filter or filter unit, having a filter external to the ug for both holding the unit l 1nd definitely l miting the cake formation upon it, comprising a pivoted bar and aelmnp for the same for securing or releasing the unit.

the cake formation upon it, and fluid 1 a filter E 33. septum,

A filter or filter unit, comprising a and a form for carrying it, embodying means for stretching it while upon the form.

3%. A filter or filter uniteomprising a septum, :1 carrying form, and a pipe loose from said form and, secured to said septum in combination with mechanical external supports for said unit acting against the septum and form and means for mounting the said supports end the said pipe holding said form and septum in fixed relation to said pipe.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses this QQth day of August 1908.

CL KR-EN CE (l. P XTTERSON.

Witnesses 2 E. F. DEAI M. h'lns'rsn'r. 

